I have a +/- 10 year old Quisinart DGB-500 series Grind N Brew with the 10 cup insulated carafe. I thought I was drinking great coffee until I started home roasting recently. I then needed to brew a better cup with this brewer and found this thread.I performed the suggested mod using 2 pieces of 1/2 ID food grade home brewing hose to create a double walled insulation. I also activated the 2-4 cup option for the 10 cup brew. I went from a constant 185 degree F delivery before modification to 203 degrees F delivery to the basket after the mod.A full 18 degree increase in temp, consistent after 5 days of 5am auto grind and brew functionality using SweetMarias Costa Rica Helsar Leo Rohas Rola at Full City Roast each time.While not a Technivorm brewer ($$$) this old Quisinart now produces a fabulously fragrant and flavored cup of coffee.Thank you PhillyRick for your insight. It is greatly appreciated.

I'm not sure how much the 2-4 cup option is helping; on the DCC-1200 all it does is interrupt the brewing periodically to prolong the contact time--it does nothing to the temperature. The usual brewing time is about 1 min per "cup"; for 10 cups with the 2-4 cup button pressed the brewing time must be 15-20 min. One would think that would produce a bitter and over-extracted brew.

After more experimental fun I find I was misinterpreting "Flavor" for an over extracted brew. With the insulation in place and otherwise normal settings we are now enjoying a better brew.Thanks again for your help.

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